/Engine/Plugins/Online/OnlineFramework/Source/Party/Public/Chat/SocialPrivateMessageChannel.h
A modified version of a chat room that only contains two participants - the current user and a private recipient of their messages. This is equivalent to sending a "whisper".
[UCLASS](Programming/UnrealArchitecture/Reference/Classes#classdeclaration)() class USocialPrivateMessageChannel : public [USocialChatChannel](API\Plugins\Party\Chat\USocialChatChannel)